This
is an archive of thousands of questions visitors have sent
me (Dr. Sten Odenwald) since August 1995.

If you use this resource, please consider making a donation
to the Astronomy Cafe to keep our doors open for future visitors.

The Top-100 most frequently asked questions at Ask the Astronomer
from 1995 to 2015! Over 10 million requests for these FAQs.
What is Dark Matter? Will Betelgeuse become a supernova? Can
a planet ever explode? And many others!!! ($9.26; 10 tables; 156 pages)